Include Base Amount data in Donation History Export Tool

give_export_base_amount.php

<?php
function give_export_base_amount() {
	?>
	<li>
		<label for="give-export-payment-base_amount">
			<input type="checkbox" checked name="give_give_donations_export_option[base_amount]" id="give-export-base_amount"><?php _e( 'Base Amount', 'give' ); ?>
		</label>
	</li>
	
	<?php
}

add_action( 'give_export_donation_standard_payment_fields', 'give_export_base_amount' );

/**
* Thi function sets the column header in the generated CSV file for the custom field. Add an if statement for each aditional field.
*/
function give_export_base_amount_column_header( $cols ) {
	if ( isset( $cols['base_amount'] ) ) {
		$cols['base_amount'] = __( 'Base Amount', 'give' );
	}

	return $cols;

}

add_filter( 'give_export_donation_get_columns_name', 'give_export_base_amount_column_header' );

/**
* This function populates the CSV with the custom field data. Add an if statement for each aditional field.
*/
function give_export_base_amount_data( $data, $payment, $columns, $instance ) {
	if ( ! empty( $columns['base_amount'] ) ) {
		// Get the post object
    	$post = get_post( $payment->ID );
		// Check if the post has a parent
		if ($post && $post->post_parent) {
			// Get the parent post ID
			$parent_id = $post->post_parent;

			// Get the meta value from the parent post
			$meta_value = get_post_meta($parent_id, '_give_cs_base_amount', true);
			if ($meta_value) {
				$data['base_amount'] = $meta_value;
			}
		} else {
				$data['base_amount'] = $payment->get_meta( '_give_cs_base_amount' );
			}

	}

	return $data;
}

add_filter( 'give_export_donation_data', 'give_export_base_amount_data', 90, 4 );